I went here: Plex for Android - #338 by romancamelia. I downloaded an older Plex client version 8.31.2.31546 for Google Play arm64v8a and it no longer goes back to the start. I’m using a 2019 Shield so arm64v8a was appropriate.
UPDATE: I sided-loaded a bunch of different versions of the APK and found that Plex for Android 9.3.1 worked best.
